Alleles are different forms of a gene that control the same characteristic, like flower color, and they sit in the same places on homologous chromosomes.
The alternative form or variations of a gene are referred to as "alleles." Each parent transmits one allele per autosomal gene to their offspring, and we routinely classify these alleles. A gene can have two or more alleles, which are variations of it, and they can all occur at the same spot on a chromosome, or locus. The occurrence of many alleles for a certain trait is referred to as "heterozygous" in genetic terminology. If the two copies of the gene are different from one another, you have a heterozygous genotype.
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